diff --git a/libsignal-service/src/main/java/org/whispersystems/signalservice/api/backup/BackupKey.kt b/libsignal-service/src/main/java/org/whispersystems/signalservice/api/backup/BackupKey.kt
index d9ba9f4b29..8b81a73ef0 100644
--- a/libsignal-service/src/main/java/org/whispersystems/signalservice/api/backup/BackupKey.kt
+++ b/libsignal-service/src/main/java/org/whispersystems/signalservice/api/backup/BackupKey.kt
@@ -51,7 +51,7 @@ class BackupKey(val value: ByteArray) {
   }
 
   fun deriveMediaId(mediaName: MediaName): MediaId {
-    return MediaId(HKDF.deriveSecrets(value, mediaName.toByteArray(), "Media ID".toByteArray(), 15))
+    return MediaId(HKDF.deriveSecrets(value, mediaName.toByteArray(), "20231003_Signal_Backups_Media_ID".toByteArray(), 15))
   }
 
   fun deriveMediaSecrets(mediaName: MediaName): MediaKeyMaterial {